Insulating cup sleeve



FIG. 1 is a top perspective view of the design of an insulating cupsleeve showing the new design;

FIG. 2 is a bottom perspective view of the insulating cup sleeve shownin FIG. 1; and,

FIG. 3 is a front elevation view of the insulating cup sleeve shown inFIG. 1 (the rear elevation view, the right side elevation view, and theleft side elevation view of the insulating cup sleeve are each anidentical image of the view shown in FIG. 3).

The features shown in broken lines depict environmental subject matteronly and form no part of the claimed design.

CLAIM The ornamental design for an insulating cup sleeve, as shown anddescribed.